Store USB device permissions in website settings.

chrome/browser/usb/usb_permission_context.cc

Index: chrome/browser/usb/usb_permission_context.cc
diff --git a/chrome/browser/usb/usb_permission_context.cc b/chrome/browser/usb/usb_permission_context.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e5b140da93f5763cd7075f9912fd25c35d16cb87
--- /dev/null
+++ b/chrome/browser/usb/usb_permission_context.cc
@@ -0,0 +1,128 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/stl_util.h"
+#include "base/strings/utf_string_conversions.h"
+#include "base/values.h"
+#include "chrome/browser/usb/usb_permission_context.h"
+#include "device/core/device_client.h"
+#include "device/usb/usb_device.h"
+
+using device::UsbDevice;
+
+namespace {
+
+const char* const kDeviceNameKey = "name";
+const char* const kVendorIdKey = "vendor-id";
+const char* const kProductIdKey = "product-id";
+const char* const kSerialNumberKey = "serial-number";
+
+bool CanStorePersistentEntry(const scoped_refptr<const UsbDevice>& device) {
+  return !device->serial_number().empty();
+}
+
+const base::Value* FindForDevice(const base::ListValue& device_list,
+                                 const scoped_refptr<const UsbDevice>& device) {
+  const std::string utf8_serial_number =
+      base::UTF16ToUTF8(device->serial_number());
+
+  for (size_t i = 0; i < device_list.GetSize(); ++i) {
+    const base::DictionaryValue* device_dict;
+    if (!device_list.GetDictionary(i, &device_dict))
+      continue;
+
+    int vendor_id;
+    int product_id;
+    std::string serial_number;
+    if (device_dict->GetInteger(kVendorIdKey, &vendor_id) &&
+        device->vendor_id() == vendor_id &&
+        device_dict->GetInteger(kProductIdKey, &product_id) &&
+        device->product_id() == product_id &&
+        device_dict->GetString(kSerialNumberKey, &serial_number) &&
+        utf8_serial_number == serial_number)
+      return device_dict;
+  }
+  return nullptr;
+}
+
+scoped_ptr<base::Value> ValueFromDevice(
+    const scoped_refptr<const UsbDevice>& device) {
+  scoped_ptr<base::DictionaryValue> device_dict(new base::DictionaryValue());
+  device_dict->SetString(kDeviceNameKey, device->product_string());
+  device_dict->SetInteger(kVendorIdKey, device->vendor_id());
+  device_dict->SetInteger(kProductIdKey, device->product_id());
+  device_dict->SetString(kSerialNumberKey, device->serial_number());
+  return device_dict.Pass();
+}
+
+}  // namespace
+
+UsbPermissionContext::UsbPermissionContext(Profile* profile)
+    : ChooserPermissionContextBase(profile, CONTENT_SETTINGS_TYPE_USB),
+      observer_(this) {
+  usb_service_ = device::DeviceClient::Get()->GetUsbService();
+  if (usb_service_)
+    observer_.Add(usb_service_);
+}
+
+UsbPermissionContext::~UsbPermissionContext() {}
+
+void UsbPermissionContext::GrantDevicePermission(const GURL& origin,
+                                                 const std::string& guid) {
+  DCHECK_EQ(origin, origin.GetOrigin());
+  scoped_refptr<UsbDevice> device = usb_service_->GetDevice(guid);
+  if (!device)
+    return;
+
+  if (CanStorePersistentEntry(device)) {
+    GrantObjectPermission(origin, ValueFromDevice(device));
+  } else {
+    ephemeral_devices_[origin].insert(guid);
+  }
+}
+
+void UsbPermissionContext::RevokeDevicePermission(const GURL& origin,
+                                                  const std::string& guid) {
+  DCHECK_EQ(origin, origin.GetOrigin());
+  auto it = ephemeral_devices_.find(origin);
+  if (it != ephemeral_devices_.end()) {
+    it->second.erase(guid);
+    if (it->second.empty())
+      ephemeral_devices_.erase(it);
+  }
+
+  scoped_refptr<UsbDevice> device = usb_service_->GetDevice(guid);
+  if (!device)
+    return;
+
+  scoped_ptr<base::ListValue> device_list = GetChosenObjects(origin);
+  const base::Value* entry = FindForDevice(*device_list, device);
+  if (entry) {
+    RevokeObjectPermission(origin, *entry);
+  }
+}
+
+bool UsbPermissionContext::HasDevicePermission(const GURL& origin,
+                                               const std::string& guid) {
+  DCHECK_EQ(origin, origin.GetOrigin());
+  auto it = ephemeral_devices_.find(origin);
+  if (it != ephemeral_devices_.end())
+    return ContainsValue(it->second, guid);
+
+  scoped_refptr<UsbDevice> device = usb_service_->GetDevice(guid);
+  if (!device)
+    return false;
+
+  scoped_ptr<base::ListValue> device_list = GetChosenObjects(origin);
+  return FindForDevice(*device_list, device);
+}
+
+bool UsbPermissionContext::IsRestrictedToSecureOrigins() const {
+  return true;
+}
+
+void UsbPermissionContext::OnDeviceRemoved(scoped_refptr<UsbDevice> device) {
+  for (auto& map_entry : ephemeral_devices_)
+    map_entry.second.erase(device->guid());
+}